Osteogenesis imperfecta is a condition of brittle bones, low muscle mass, and lax joints and ligaments. There are several types of this condition. Specific symptoms depend on the specific type and may include: 1  Blue or gray tint to the whites of the eyes. 2  Thin skin. 3  Curved spine. 4  Breathing problems. 5  Hearing loss.
Ashford Black Marble is the name given to a dark limestone, quarried from mines near Ashford-in-the-Water, in Derbyshire, England.Once cut, turned and polished, its shiny black surface is highly decorative. Ashford Black Marble is a very fine-grained sedimentary rock, and is not a true marble in the geological sense.It can be cut and inlaid with other decorative stones and minerals, using a technique known as pietra dura. Derby Museum has a diagram of Ecton Hill made from Ashford Black Marble and other minerals.shford Black Marble is a very fine-grained sedimentary rock, and is not a true marble in the geological sense.
Itâs extremely hard and resistant to the elements. In fact, granite can be found almost anywhere in the world, but black granite is highly valued because of its unique and expensive look especially for creating grave markers and headstones.Some of the regions in the world where black granite can be found are China, South Africa, Scandinavia, and India.China has very pure forms of black granite known as Shanxi Black A Grade, one of the densest forms of granite.tâs extremely hard and resistant to the elements. In fact, granite can be found almost anywhere in the world, but black granite is highly valued because of its unique and expensive look especially for creating grave markers and headstones.